kimclps:使用說明書Chapter 2 page 26
QB[s8"S The chief ray (or principal ray) from every field point will be iterated to pass
ja;5:=8A5 through the center (x=0, y=0) of the stop surface, unless you override this behavior
%&Cl@6 with chief ray aiming (this is only necessary in a few unusual sit ..
(2016-10-10 14:44) T,uIA]